Threading-machine.



HJGAUTSC HI. THREADING MACHINE.

APPLICATION FILED NQV. 26. I912.

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Patented Sept. 7, 1915;

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eman H. GAUTSCHI.

THREADING MACHINE.

APPLICATION FILED NOV.26. 19:2.

Patented Sept. 7, 1915.

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THREADING'MACHINEx APPLICATION man NOV.26 1912.

PatentedSept. 7, 1915.

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H.GAUTSCH|. THREADING MACHINE.

APPLICATION FILED NOV. 26 l9l2.

Pateilted Sept. 7, 1915.

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HENRY GA'UTSCHI, 0F EVANSI'QN, ILLINOIS.

THBEADING-MACHINE.

apecifieation of Letters Patent.

Patented Sept. a, rent.

Application filed November 26, 1912. Serial No. 733,579.

To all whom it may concern:

Be it known that I, :HENRY Gaursoni,

citizen of the Republic of Switzerland, re-.

siding at Evanston, in the, county of Cook and State of Illinois, have invented certain. new and useful Improvements in Threading-lllaehines, of which the following is a specification, reference being had to the accompanying drawings, in which Figure 1 is a front elevation of one end of a threading machine embodying my invention, with an end cover-plate for the threading dies partly broken away to show the threading dies in their retracted position. Fig. 2 is a similar view of the same machine with the cover-plate removed and certain. parts in section, and showing the tl'ireading dies in their projected position and in on gagenient with a pipe to be threaded. Fig.

3 is a side elevation of the threading maciine of Figs. 1 and .3. Fig. l is a longitudinal sectional view of the threading machine of Figs. 1, 2 and 3, taken. on the line 41-4: of Fig. 2. Fig. 5 a rear elevation. of the threading machine with the rear cover-plate removed to show the centering blocks and clamp. Fig. (3 is a detail view showing a means for automatically releasing the threading dies at the end of a threading operation of the machine. Fig. 7 is a detail sectional view of a portion of a threading die and a pipe to show the graduated cut- Y ting thread on the threading die. Fig. 8 is a diagrammatic view showing two successive positions of the threading dies and their relative positions to a pipe-to be threaded.

My invention relates to threading machines, and more particularly to machines for forming a screw thread on pipes, rods and similar objects.

I will describe a threading machine embodying my invention, and then point out the novel features thereof in claims.

Similar letters of reference designate corresponding parts in all of the figures.

As will be seen from Figs. 3 and 4., the machine comprises two main parts A and B, which are arranged to have relative longitudinal and rotary movements. The part A carries the threading dies (1. (Figs. 1, 2, 4: and 8) whilethe part B carries centering blocks 4L0 by which the machine is properly centered on the pipe or rod to be threaded,

as well as a form of clamp by which themachine is held on the pipe or rod. These clamps are best seen in Fig. 5. Relative longitudinal and rotary niovei'nents between the parts A and B are secured, as here shown, by means of an exteriorly screw-threaded cyl ndrical section a of the part A eoacting with an interiorly screw-threaded cylindrical. section Z) of the part B. As the part A is rotated by the hand grips a in the threading operation, the screw threaded portion a travels along the screw-ti'ireaded portion 5 The extent of this relative longitudinal movement may be any desired, decnding upon the length of thread to be formed on the pipe or red. When the desired length of thread has been formed, the threading dies are automatically di n ag d from the pipe or rod in a manner to l. i; inaftcr described.

Referring now more particularly to Figs. 1, 3 and it, the p' 7" A provide l plate or base a or, which are moun. threading dies (4, and. which are held thereon by a plate 100. The dies 0; are adjustably mounted on the plate a in order to operate upon any diameter of pipe between the minimum and maximum diameter for which the machine is designed, and in addition to this adjustability for di'tlerent diameters of rod or pipe, the threading dies have a movement toward and away from the pipe or rod to be threaded, and still another movement relatively to the surface of the pipe or rod in order that the cutting surfaces of the dies may always be presented to the surface to be threaded at the proper cutting angle. The plate or base a is provided with four guiding grocwes or slots 1., which receive projections or studs 2, carried by die blocks a one such groove or slot being provided for each. block a 'lhe plate or base 0. is also provided with other guiding grooves or slots 3 which. rec projections or studs l carried by the dies (1, one such groove or sl b provided for each die a. Each the block a, is

provided witha recessed portion a between 1 .to the grooves or slots 3. Consequently, when a die block moves in its groove 3, to project or retract the dies a, each die carried by its die block will have an independent movement due to its stud 4 moving in its groove or slot 3. This independent movement of the dies at is clearly seen in Fig. 8 from the two dotted line positions of the circular projection or stud of the dies. This independent movement of the dies relatively to the movement of the die blocks is an advantage in that the cutting edges of the dies will always be presented at the same angle to the surface of the pipe or rod to be threaded, irrespective of the diameter of the pipe or rod. It will also be noted that the projections or studs of the die blocks are elongated so that there will be no lost motion in the die blocks when the machine is being operated, due to wear, so that at all times the .die is rigidly held against any movement away from the pipe' or rod being threaded.

The simultaneous movement of the die blocks is secured by means of a handle 15, having a yoke 16 which is secured to a collar 17, loosely held on one end of a rod 18 which is mounted in the plate or base a in such manner as to have longitudinal and rotary movements. One of the die blocks a is secured to a nut 19 by means of a screw 20 which passes through an elongated opening of its groove 1. When the handle 15 extends in line with the rod 18 (see Fig. 1), the dies are retracted, and when the handle is turned to the position shown in Fig. l, the rod 18 is moved longitudinally and the dies are projected toward the pipe or rod. 'In this longitudinal movement a coiled spring 21 is compressed, the spring being confined between a collar 22 fixed on the rod 18 and a lag 23 formed on the base or plate a The compression of this spring 21 is made use ofto automatically retract the dies (1, from the pipe or rod after the threading operation, in a manner to be hereinafter described.

The adjustment of the dies for the varying diameters of pipe or rod for which the machine is designed is accomplished by rotating the rod 18 at its squared end 21, which rotation causes a movement of the nut 19 on the screw threaded portion 25 of the rod 18. A scale 27 is provided on the base or plate a over'which a pointer 28 travels, which pointe is carried by one of the die blocks; This is shown best in Fig. 2.

The automatic retraction of the dies at the end of the threading operation is secured through a plate 30 having a slot through which the end of the rod 18 projects. This plate is secured at one end by a screw 31 to a projection 32 carried on a ring 33, which is held on the cylindrical section b of the part B in such manner that it can rotate with the part A. The ring 33 being carried by the part B, which is fixed on the pipe or rod, as the part A is rotated in the threading operation, there will be a relative longitudinal movement between the part A and the plate 30. As hercinbciore described, the dies are projected by means of the handle 15 moving the rod 18, and this is secured through the cam surfaces 32 provided on the yoke 16 of the handle. By moving the handle from its position shown in Fig. 1 to its position shown in Fig. e the dies are held in'engagement with the pipe. As the threading operation is carried on, thepart A moving into the part B, the cam surfaces 32 are. brought opposite depressions 33 in the plate 30, at which point the spring 21 acts to move the rod 18-inwardly and this retracts the dies from the pipe or rod. This is shown best in Fig. 6. The plate 30 is also provided with an inclined face 36 the purpose of which is to provide a tapering screwthreaded surface on the pipe or rod. It will be seen from Fig. 7 that the cutting ends of the die are tapered sothat as the threading operation is started a slight depth of cut is first made, and this is gradually made deeper as the. threading operation is proceeded with until the whole cutting face of the die is brought into operation. The plate 30, however, is thickest at one end, as is shown 111 Fig. 6, at which point the pretest pressure is desired for the initial starting of the thread, and tapers gradually toward the other end and permits the retraction of the dies as the work progresses, with the result that while the cut is at first progressively deeper until the full cutting face of the die is brought into play, the depth of the cut is actually lessened as the work proceeds by the amount which the taper on the plate 30 permits the dies to retract.

The centering of the threading machine on the pipe or rod to be threaded is secured by centering blocks 10 mounted on the base or plate Z) and held thereon by a plate 110. The base or plate 6 is preferably provided with four grooves 41 arranged at right angles (or it may be a single continuous groove arranged as shown) and fitting and movable in said grooves are studs 42, one being pro- .vided for each block 4.0. Each centering block 40 is provided with a face 49. to en-.

gage with. the pipe or rod, and with angular or inclined faces 43 which engage and coact with similar faces on the adjacent blocks. The adjustment, and projection and retraction of the centering blocks 40 is secured by means of a key bolt 46. The threaded end of this key bolt works in one of the centering blocks and the key bolt is held against longitudinal movem"nt by means of collars 44:, which engage with the end walls of an opening 45 in the base or plate I). Vhen the key bolt 46 is turned in one direction or the other, the centering block to and simultaneously operates an the "other centering blocks in the same direction. The

keyl bolt l6, therefore, is used to adjust the positions of-the centering blocks f or different diameters of pipes or rods and to move theclamps onto and away from the pipe or 1 (see 5).

rod.

Any movement of the machine on the pipe or rod during the threading o e'ration is prevented by a clamp which is ere shown as consisting-of a screw bolt 50 which extends through one of the centering blocks Having thus described my invention, what I claim is:

L'A threading machine comprising a holder for'a plurality of die-carrying members, each 'die-carrying member having a slot and projection engagement with the holder, the said slots and projections being arranged on-tangents toithe circumference of a circle of which the axis of the holder is the'center, a die being mounted in each diecarrying member and being movable relatively thereto,the movement of the die-carrying members constituting means for regulating thepositioiibf the dies.

' said frame and eing adapted for movement relative to said frame, a die mounted in- 2. threading machine comprising a f frame, diecarr ing members mounted in each die-carrying member and movable relatively thereto, each member being adapted to be actuated to advance and retract 1ts die in a direction at ail-angle to the direction of movement'of the member.

3. A threading machine comprising a I frame and a clamping part, the said frame 40 and the clamping part having relative longitudinal' and rotarymovements for securing a feed motion of the frame, die blocks mounted in said frame, guiding means for the die blocks comprising a slot and projection engage ent between the frame and each die block, t reading dies carried by said die blocks, other guiding means in said .frame comprising a slot and projection engagement between each die and the frame,

the'said slots and projections constituting means for regulating the. position of the threadingdies, and means for moving the die blocks in said frame.

4. A threading machine comprising a diecarrying part and a clamping part, said ried by the die-carrying part, die blocks mounted on said plate and arranged for movement upon tangents to the circumference of a circle of which the axis of the diecarrying part is the center, means for moving the die blocks, and threading dies carried by said die blocks and adapted to have a movement in the die blocks relative thereto when the die blocks are moved and actuating mechanism for moving the die blocks in said tangential direction, whereby a cooperative movement relative to the die blocks and to the plate is imparted to the dies to adjust them for varying diameters of pipe to be threaded.

5. A threading machine comprising a dice carrying part, a clamping part, said parts having relative longitudinal and rotary movements for securing a feed motion of the die-carrying part, a plate or. base carried by the die-carrying part, a plurality of grooves formed in said plate, dieblocks mounted on said plate and having elongated projections fitting in said grooves, the said grooves and projections comprising guiding means for the die blocks, threading dies carried by, said die blocks, other grooves" in said plate, projections carried by the dies and fitting in said last mentioned grooves, the said sets of 'grooves and projections constituting means for regulating the position of the threading dies, and means for moving the die blocks on said plate.

6. A threading machine comprising a diecarrying part and a clamping part, said parts having relative longitudinal and rotary movements for securing a feedmotion of the die-carrying part, die blocks mounted,

on the die-carrying part, means for moving the die blocks, and dies carried by the die blocks, the said dies being arranged l for movement independently of the movement of the die blocks and transverse thereto, the movement of the die blocks constituting means forregulating the position of -the 

